Spray gun



G. H. PALM Sept. 23, 1952 SPRAY GUN 2 SHEETS-SHEET l Killlllllf.

.4. M E w W 7 3 6 3 2 4 Ov 1|. il G. 8 3 n mw U, l V/f/ f f f l fr l @gwG. H. PALM Sept. 23, 1952 SPRAY GUN 2 SHEETS- SHEET 2 Filed Jan. 24,1948 fraz/enfon- Gfqjgeffalm da@ @LA Patented Sept. 23, y 1952 lorf-FICESPRAY GUN George rr. Palm, chicago, 111., assigner to Illinois Chicago,Ill., a corpora- StampingA & Mfg. Co. tionlof Illinois ApplicationJanuary 24, 1948, Serial No.. 4,111

10 Claims. 1 Y

This invention relates to a spray gun. and among its objects are theprovision of means whereby the spray gun may be used to spray paints,varnish, lacquer, disinfectant and other liquids. and having anattachment which, when in use, provides means for spraying a foamycleaning compound upon carpets, rugs, furniture and other articles thatare to be cleaned. Y

Another object is the provision of novel means for containing and supportingthe valve mechanism of the spraygun whichcontrols the iiow ofthe liquid from the container to the nozzle.-

Another object is the provision of novel means providing an air passagevto and around the nozzie, thereby providing an aspirating action on theliquid.

Another object is the provision of ka removable and replaceableattachment,- whereby a foamy cleaning compound may be sprayed.

Another object is to provide a spray gun having few parts and is simplein construction and operation. Gther objects and advantages will appearin the course of Athis specicationand with said objects and advantages'in view. this 'invention consists in the several'novel features ofconstruction, arrangement and combination of parts hereinaiter fullysetforth land more particularly defined in the appended-claims..

The invention is clearly illustrated in the drawings accompanying thisspecification, in which:

Fig. 1 is a central vertical longitudinal section through a spray gunembodyingfa simple form of the present invention; f

Fig. 2 is a view partly in planand partly in horizontal section taken onthe line2-2-o'f Fig. 1;

Fig. 3 is a horizontal section taken on the line 3-3 of Fig. 1;

Fig. 4 is a central vertical vcross section partly broken awaytaken onthe lineli--d of Fig. 1;

Eig. 5 is a side elevation partly broken away of the spray gun seen inFig. l1I with the foam spraying attachment secured thereto;

Fig. 6 is a plan of the partsseen in Fig.'5;

Fig. 7 is an enlarged horizontal: section partly broken away takenon theline '1 1 of Fig. 5;

Fig. 8 is anvend 'elevation ofr a' foam sprayer shell looking in'thedirection of the arrows's, 8 in Fig.5; f

,Fig.. 9 is a vertical crcsssection of the attachment taken along theline V.ii-9 of Fig. 6;

Fig. 10 is an end elevation .of a spring clip of the attachment,looking-iin, the. direction.` of the arrows I0 in Flg.6;; f

plan and partly in cross section of the spring clip and head showing theparts as they appear before assembly; and Y Fig. 12 is a fragmentaldetail view of the parts seen in Fig. 11 after assembly.

Referring to said drawings and rst toFigs. 1 to 4 inclusive, thereference character I5 designates a sprayer head removably securedupon ajar. l5 or other containerfor holding paint, varnish, lacquer,insecticide or other'liquids, or for holding a cleaning compound. Y j

The sprayer head comprises an outer shell or capv I l having parallelside walls Hija bowed end wall i9 formed with a discharge opening 20, atop wall 2|, and a rear wall 22 formed with an air opening 23 aroundwhich is secured the end wall 24 of a tubular hose connection 25, fromwhich leads a hose or other flexible tubular inember 26 which runs to asource of air under pressure such for instance, the discharge side of avacuum cleaner (notshown). The hose connection may be secured to thewall 22 of the shell or cap I'lby a flange il` formed on the wall V22,which surrounds'the opening 23V and is spun down upon `the wall 24 ofthe hose connection.

The lower end of the'shell or cap I1 is turned outwardly radially as at28 to cverlie the upper end of the `jar or container I6 and terminates'4in an annular downturned flange 29 which surrounds the neck of the jarandis formedwith several linwardly struck up v'threads 30 thatthreadedly engage withthel usual threads on the neck of the jar.- y 1Secured to the lower ends of the Walls oi the outer shell or'cap Il isan inner shell 3l spaced from the wallsof the outer shellor cap to leaveair passageways between 'the two yshells,through which airV underpressure may flowfrom the hose connection 25 to and throughthedischargeopening 2D.

The lower portion 'of the inner shell is-,c-ylindrical as at 32, and theupper, part of the wall of the inner shell is'flattened as at133 toprovide' for relatively wide passageways aroundv the inner shell. Theupper endpof4 the inner' shell is provided with a top walland the lowerend of the inner shell extends 'outward' radially asfat .35 to the walls18,13 kand 22 lof `thej 'outer shell and is bent downwardly as ati tofrictionally engage said Walls.- The lower en d of the wall 3S extendsoutwardly radially as at'lfand contacts the wall 28 of the'outer shell."The marginal redge 38 olf the -Wall 31 is circular and )flares downwardslightly and'provides means-to Vretain a "washer I 39 on the kundersideof Vth e vwall 2tA for" making a leak-proof ljoint with the jar or othercontainer. The two shells I5, 3i may be formed of drawn sheet metal orotherwise as desired.

Secured in the inner shell as by a press t is a valve seat 49 whoseouter cylindrical face conforms to the cylindrical portion 32 of theinner shell. Secured in a. bore in the lower end of the valve seat, asby a press iit, is a tube il whose lower end terminates slightly abovethe bottom of the jar. Above the tube, the valve seat is formed with atapered bore 42l and a disc-like valve 43 normally seats on the wall ofthe tapered bore. The valve 43 is secured upon the lower end of a valvestern 44 which extends up through a A hole in the top wall 34 of theinner shell at which place, the valve stein is non-circular in crosssection and moves through a correspondingly shaped opening. To the upperend of the valve stem is threadedly secured a flanged push button 45which extends out through a, hole in the top wall 2l of the outer shell.A coiled compression spring 46 is interposed between the top wall 34 ofthe inner shell and the lower side of the push button and functions tohold the valve on its seat.

Secured, as by a friction fit, in a nipple 41 formed on an end wall ofthe inner shell is a dischargenozzle 48 which is arranged in coaxialalignment with the discharge opening 2! in the outer shell. Saiddischarge nozzle terminates at a point in close proximity to thedischarge opening. The discharge nozzle 48 being in exact coaxialalignment with the discharge opening 20, the sprayed liquid willVdischarge in uniform density.

In use, the jar or other container is filled with the liquid which is tobe sprayed upon articles, and the hose connection is connected to asource of air under pressure by the hose or other flexible connection2,6. The user may grasp the hose connection in using the spray gun andhe depresses the push b utton, thereby unseating the valve 43 permittingthe contents of the jar to be drawn up tlnougii the tube 4I by theaspirating action of the air passing around the discharge nozzlev 4,8,the air breaking up the vdischarging liquid into minute particles andspraying them upon the article to be sprayed. .A small orifice 50 in thewall 35 of the inner shell permits air under pressure to enter the jarand thereby facilitate movement of the liquid upward through the tube 4I. By releasing the push button, the discharge of` the sprayed liquidceases.

In the form of the invention illustrated in Figs. to 12 inclusive, thesprayer head l5, hose connection and jar I6 illustrated in Figs. 1 to 4inclusive, may be used. In this formk of the invention, a foam sprayerin the nature. of an attachment designated generallir by the referencecharacter 5l is used. Y

The attachment comprises, in general, a foam sprayer shell 52 open atboth ends and having one enlargedl end 53 removably secured on acentrally bored cylindrical head 54 as by several inwardly struck upthreads 55 arranged to engage with screw threads 5 5V formed on the head54. 01.1 011e' face, Oi'` the head 54 is formed a flange 5,5 which issecured in a hole in the 'base mem'- ber 51 of a spring clip 58, andprojecting from said flange 56,' is a. tubular member 59, thebore; ofwhich is in coaxial alignment with the bore in the head 54. The clip andbored head54 may be secured together as follows :i in the base 51Gftheclip is, formed a -reuilar hole 65 (scema. 10.2 with Severalnotches radiatinstherefrom- Theange 56,.- ofthe bored heal-itsin;theffhole.v`

charge nozzle 48;VY The inner wall of the tubular member 59 flaresoutwardly as at 59a to provide an air inlet to the bore of the tubularmember.

.The clip has two arms 60 that project from its base member 51 andnormally converge somewhat toward their free ends.

The attachment is secured uponthe sprayer head 15 by sliding the armsalong the side wall of the outer shell of the sprayery head andinserting the tubular member 59 through the opening 20 in the outershell, the inherent resiliency of the arms serving to firmly grip thesprayer head and hold the attachment thereon. Y

Qn the opposite face of the headv 54 is formed a tubular member 6Ithrough which the sprayed material discharges into the foam sprayershell. Between the head 54 and the inturned edge 62 of the foam sprayershell are several foraminated flanged discs 63. the iianges of whichContact with the inner lface of the foam sprayer shell and space thediscs 63, apart. 'The flanged discs may bf0rii1edv 0f. sheet metalpunched with suitable dies to provide a multiplicity of apertures ineach dis@z or. they may be formed of wire mesh, as desired. Y Y s Inusing the ,Spray aun with the attachment. the jar IB is nlled with asuitable liquid cleaning compound and air under pressure is admitted tothe sprayer head. By depressing the push button 45, the valve 43` isVunseated permitting air under pressure. to. discharge the cleaningcompound through the-nozzle 4.8, where it encounters theVseveralqforaminated discs in the foam sprayer shell and is blown throughthe perforations thereof; itis therefore agitated and broken down into.a. oamycondition. The discharging airy reduces the foam to a spray as itiS being discharged from the foam sprayer shell` kAny suitable liquidcleaning' compound which canv be broken down into aioamy condition maybe used. The compound maycomprise a soapy solution or it may-bevcomposed of chemicals such as are used inthooam?" method of cleaning.Aspray gun equipped with. thev above described attachment may bev usedto. sprayv aV cleaning coin-` pound foam upon carpets,4 rugs,vupholstery and many .other articles...

Having thusk described my: invention, it is obvious that variousimmaterial modifications may be made in the saine without departing fromthe spirit of my invention; hence, I doI not wish to be understood as,limiting myself to the exact form, constructiong. arrangement andcombination of parts hereinA shown andl described or uses mentioned. a

What; I claim .-asnew. and desire to. secure by Letters Patent is? Yl 1. In agspray gun, a sprayer head 4comprising an outer.sheet.arnetalShelli-,having a ldischarge opening therein, an inner sheetmetal shell,therebeing air passageways between the shells, and a liquid passagewayin theinner shell, a discharge nozzle securedtotand.projecting from theinner shelll in coaxial alignment with the" discharge openlngsaidouterfshell having an integral lower end formed with a radiallyextending wall ter- 'Ni mliatng ina cylindrical 'ange'provided withmeans to secure thesprayer head upon a conf tainer, and the inner shellbeing formed lwith a radially` extending wall terminating in a downfturnedwall conforming to and held in frictional contact; with-the yWallof the outer shell, the downturned wall of the inner shell terminatingin a radially extending Wall contacting with the radial wallvof theouter shell and yformedwith a,Y washer retaining edge portion and aliquid intake tube' suspended from said inner shell and operativelyconnected tothe liquid passageway in said inner shell.

2. In aV spray gun, a sprayer head comprising an outer shell having adischarge opening therein, andY an'inner'shell, there being airpassageways between the shells, and a liquid passageway in theiinnershell, adischarge nozzle secured to and projecting from the inner Vshellin coaxial alignment with the discharge opening, the lower end of theouter shell being formed with a radially extending wall terminating in acylindrical flange provided with threads to secure the sprayer .headupon the threaded neck of a jar, and the inner shell being formed with aradially extending wall terminating in a downturned wall conforming toand held in rictional contact with the wall of the outer shell, thedownturned wall of the inner shell terminating in a radially extendingwall contacting with the radial Wall of the outer shell and formed witha flaring washer retaining edge portion.

3. In a spray gun, a sprayer head comprising an outer sheet metal shellhaving a hose connection adapted to be connected to a source of compressed air on one wall thereof and a discharge opening in another wallthereof, an inner sheet metal shell, therebeing air passageways betweenthe shells,L a liquid passageway in the inner shell, a discharge nozzlesecured to and projecting from the inner shell iny axial alignment withthe discharge Aopening in said outer shell, said outer shell having anintegral lower end formed with a radially extending wall terminating ina cylindrical iiange provided with threads to secure the sprayer head`upon the threaded neck of a container, and the inner shell being formedwith a radiallyextending wall terminating in a downturned wall adaptedto be press nt within said outer shell whereby said outer and innershells are maintained in assembled relation, a valve seat press t intosaid inner shell to completely enclose the interior thereof, said valveseat having a bore `extending therethrough and communicatingwith theinterior of said inner shell, a liquid intake` tube press nt intosaidgbore and adapted to extendl into the liquid container upon whichsaidfsprayer head is mounted, an aperture in the radially extendingportion of said inner shell eX- posing the area over the liquid in theliquid container to air trapped in the air passageway deilned by saidouter and inner shells, and a movable valve member seated on said valveseat and operable against the normal flow of liquid through said intakemeans and said bore to admit liquid into the interior of said innershell.

e. In a spray gun, a sprayer head comprising a hose connection, an outersheet metal shell having peripheral front, rear and side walls and aninner sheet metal shell including a cylindrical portion secured togetherand providing a chamber, said outer shell having a lower end formed witha radially extending wall terminating in a cylindrical flange providedwith means to secure the sprayer head upon a container, said inner shellalso being formed with a radially extending wall portion ofthe radiallyextending wall of the outer terminatingin a slightly ilareddownturnediwall Y wall of theouter shell, a` gasket adapted to bemountedV in said-V-shapedgroove'to pilovide a leakproof joint betweenthe-icontainer and the sprayer head, there being air passageways betweensaid shells.k and the outer shellhaving a ,dischargel .opening in lthelfront, lwall Vand an air inlet opening inthe rear wall, af bored Valveseat secured in saidcylindricalI portion of said inner shell, al liquidintake, tube secured in the bore oi the valveseat, a valve `vattlaptedtoseaton said valve seat, an integral spring urged valve stem projectingout through-the top of. the vinner and outershelhand adapted to'controlthe flow of liquid through said valve seat, fa discharge nozzle securedto and projecting from the inner shell in coaxial alignment with thedischarge opening in the outershell, and said hose connection amxed tosaid outer shell at the air inletopening.

. 5. In a spray' gun, a sprayer head comprising an,l outer sheet .metalshell having a discharge openingI therein, and an inner sheet metalshell, there being air lpassageways between the shells, and a liquidpassageway in the inner shell, a discharge nozzle secured to` andprojecting Afrom the inner shell in coaxial alignment ywith the,discharge opening, said outer shell having a lower end formed witharadiallyextending wall termi'- nating in a cylindrical flange providedwith means to secure the sprayer head upon a container, and the innershell beingv` formed witha radially extending wall terminating in laslightly yfiared downturned wall forming a V-shaped annular groove andconforming to and held in frictional contact with the wall of the outershell, a gasket adapted to be mounted in said V-shaped groove toprovidey a leakproof joint Vbetween the container-"and sprayer head, andvalve means containedin the inner shell for controlling liquid nowthrough said dischargefnozzle.

6. In a spray gun, a sprayer head comprising an outer1 sheet metal shellhaving a discharge opening therein, an inner sheet-metal shell, therebeing air pas'sageways between the shells, a liquid passageway in theinner shell, aldischarge nozzle secured'to and projecting from ftheinner shell in coaxial alignment with the discharge opening,

said outer shell having an integral lower end formed with al radiallyextending wall terminating in a'cylindrical iiange provided with threadsto secure the sprayer head upon the threaded neckofy a' container, andthe inner shell being formedwith a radially extending wallterminating'inadownturned wall adapted to be press t within said outershell whereby said outer and inner shells are maintained in assembledrelation, a gasket retaining groove formed by a slightly ared downturnededge of the radially extending wall of the inner shell and a contiguousshell, and valve means contained in the inner shell for controlling theiiow of liquid to said discharge nozzle.

7. In a spray gun, a sprayer yhead comprising an outer sheet metal shellhaving a hose connection and a discharge opening, said outer shellprovided with an air inlet opening and having also a radially extendingwall terminating in a cylindrical iiange for attaching the sprayer headto a container, said hose connection aiiixed to said outer shell aboutthe periphery of the air inlet opening, an inner shell including ahollow cylindrical portion and secured in the sprayer head, said innershell-also formed with a radially extending wall terminating in aslightly flared downturned wall forming a V-shaped annular gasketretaining groove and conforming to and held in frictional contact withthe wall of the outer shell, a discharge nozzle projecting from thehollow cylindrical portion in coaxial-alignment with the dischargeopening, a valve seat secured in the hollow cylindrical portion of saidinner shell and having a bore extending therethrough and communicatingwith the interior of said inner shell, a liquid intake tube securedwithin said borel and having the liquid passageway therein communicatingwith the bore in said valve seat, a valve adapted to seat on said valveseat for controlling the flow oi liquid through said sprayer head, anda, valve stem for said valve extending through the top oi' inner andouter shells in axial alignment with said bore.

8. In a spray gun, a sprayer head comprising an outer shell and an innershell secured together, said outer shell having a lower end formed witha radially extending wall terminating in a cylindrical flange providedwith means to secure the sprayer head upon a container, said inner shellalso being formed with a radially extending wall terminating in aslightly ared downturned wall forming a V-shaped annular gasketretaining groove and conforming to and held in frictional contact withthe wall of the outer shell, there being air passageways between saidshells, the outer shell having an air inlet opening iny one wall and adischarge-opening in an opposite wall, a discharge nozzle secured tosaid inner shell in axial alignment with the discharge opening andcommunicating with the Vinterior of said inner shell, a valve seathaving a tapered bore extending therethrough secured in said innershell, said valve seat closing one side of said inner shell and havingthe smaller diameter end of said tapered bore spaced adjacent andcommunicating with the interior of said'inner shell, liquid intake meanssecured to said valve seat and communieating with the bore in said seat,and a spring biased movable valve member seated in the tapered bore insaid valve seat and adapted to be moved downwardly toward the greaterdiameter end of said bore for controlling the flow of liquid into saidinner shell.

9. In a spray gun, a sprayer head comprising an outer shell and an innershell having a hollow cylindrical portion and secured together anddefining an air passageway between said shells, the outer shell havingan air inlet opening in one wall and a discharge opening in an oppositewall, said outer and inner shells having portions complementally formedwhereby the inner shell is mounted within the outer shell and affixedthereto at the complementally formed portions thereof, and also forms anannular V-shaped gasket retaining groove, a discharge nozzle secured tothe hollow cylindrical portion of said inner shell in axial alignmentwith said discharge opening and communicatingwith the interior of saidinner shellf, a valve seat Yffrictionally supported within the hollowcylindrical portion of said inner shell and enclosing the interiorthereof, said valve seat having a bore extending therethrough andcommunicating with the interior of said inner shell, liquid intake meansconnected to said valve seat and communicating with the vbore therein,and a-movable valve member seated on said valve seat and operabledownwardly against the normal iiow of liquid through said intake meansand said-bore to control the flow of liquid therethrough.

10. In a spray gun, a sprayer head comprising an outer shell having ahose connection adapted to be connected to a source of compressed air onone end and a discharge opening in the opposite end, said youter shellalso having -a cylindrical iiange for attaching the sprayer head to acontainer, an inner shell having a hollow cylindrical portion andsecured within said outer shell and having a discharge nozzle secured tothe hollow cylindrical portion in axial alignment with the dischargeopening in said outer shell, said separate outer and inner shellsdefining an air passageway therebetween and having complementally formedportions at the lower ends thereof whereby the outer and inner shellsare aiiixed together and form a V-shaped annular gasket retaininggroove, a valve seat frictionally supported within the hollowcylindrical portion of said inner shell and enclosing the interior ofthe hollow cylindrical portion, said valve seat having a bore yextendingtherethrough and communicating with the interior of said inner shell,liquid intake means connected to said valve seat and communicatingwiththe bore therein, means connecting the air passageway deiined betweensaid outer and inner shells to the space over the liquid in thecontainer on which said sprayer head is mounted to facilitate removal ofsuch liquid, and a movable valve member seated on said valve seat andoperable against the normal flow of liquid through said intake means andsaid bore to admit liquid into the interior of said inner shell.

REFERENCES CITED France Oct. 3, 1932

